Valve-operating mechanism for internal-combustion engines



March 23 1926. v w. soonwm VALVE OPERATING MECHANISM FOR INTERNALCOMBUSTION ENGINES Filed-Sept. 16, 1924 ww a g Patented Mar. 23, E926.

STATES WILLIAM M. GOODWIN, OF CENTRAL SQUARE, NEW YORK.

VALVE-OPERATING- MECHANIS'M FOB INTERNAL-COMBUSTION ENGINES.

Application filed. September 16, 1924. Serial No. 738,019.

To all whom it may concern Be it known that 1', VVILLIADI M. Goon- WIN,a citizen of the United States of America, of Central Square, in thecounty of Onondaga, in the State of New York, have invented new anduseful Improvements in Valve-Operating Mechanism for Internal-Combustion Engines, of which the following, taken in connection with theaccompanying drawings, is a full, clear, and exact description. I

This inventionrelates to a valve-operat ing mechanism for internalcombustion engines of the class set forth in my Patents No. 1,270,941 ofJuly 2, 1918, and No. 1,500,556 of July 8, 1924 in which a selfclosingvalve is adapted to be intermittingly opened by means of a rotary camshaft and suitable devices for transmitting motion from the cam shaft tothe valve.

In mechanisms of this character, considerable difficulty is experiencedin preventing lost motion betwen the cam and valve and at the same timeallowing the valve to properly adjust itself to its seat, resultingin'more or less of a tapping noise and partially due to the variation inlength of the valve stem under difierent temperatures of the engine whenat rest, and when in action.

The main object of my invention is to provide simple and efticient meanscapable of automatically taking up this lost motion, and preferablyforming a part of the means for transmitting from the cam to the valve;

Another object is to provide thetake-up device with a plurality ofwedges of slightly varying lengths to conform to different distancesbetween the end of the stem of the closed valve and operating camtherefor.

Other objects and uses relating to specific parts of the mechanism willbe brought out in the following description.

In the drawings Figure 1 is a vertical sectional view of a portion of aninternal combustion engine and cam shaft, together with one of thevalves, and mechanism for transmitting motion from the cam shaft to thevalve.

Figure 2 is a vertical sectional view taken in the plane of line 22,Figure 1, showing the means for operating the wedge to take up the lostmotion. I

Figure 3 is a perspective view of the detached wedge carrying sleeve.

In order that this invention may be clearly understood, I have shown aportion of an provided with one or more cams -7 adapted to be used as aprimary source of power for intermittingly opening the valve.

-4 against the action of the spring 5-.

The means for transmitting motion from the cam 7- to the valve foropening the latter consists in this instance of a rock-arm 8 and sleeve9, which latter is supported for angular adjustment and axial movementin a bearing or bushing 10 on the engine frame 1, the axis of the sleevebeing parallel with, but at one side of the axis of the valve -4- asulficient distance to bring different sides of the sleeve intoregistration with the lower end of the valve stem when the sleeve isad-- justed rotarily to different positions for a purpose presentlydescribed.

The .rock arm 8+ is pivoted at -11 to a portion of the frame of theengine some distance to one side of the cam shaft 7 to rock verticallyabout an axis parallel with said shaft and has its other end providedwith an upturned extension 12 and a bearing roller 13, the latter beingin direct engagement with the face of the cam 7- and directly over theaxis of the shaft 'T whereby the rotation of the cam efiects a verticalreciprocatory movement of the extension -12- and a correspondingreciprocatory movement of the sleeve 9 and valve -4:.

The opposite ends of the sleeve -9- are provided with separate sets ofinclined bearing faces 14, 14; and -14tthose of each set being disposedin axial alignment and tapered circumferentially in one direction toform a wedge interposed between the extension 12. and lower end of thevalve stem -t for taking up lost motion between the valve-operating camand valve and to compensate for variations in the length of the valvestem due to varying temperatures thereof incidental to the heating orcooling of the engine.

Y mitting slight rotary movement of the sleeve The normaldistancebetween the lower end of the valve stem and face of the cam when thevalve is closed may vary slightly under diflerent. conditionsbeyond therange of adjustment of any one wedge, and there fore the lengths of thewedges or distances between the inclined faces of each set are unequalto permit the proper adjustment of the valve for normal seating.

WVhen anyone of the particular wedges is positioned between theextension -12 and lower end of the valve stem l-' it is automaticallyadjusted angularly or rotarily about its axis within the bearing'10 by acoil spring 15 arranged axially therein and having one end connected toan end partition17- and its other end-connect ed to collar- 16 which istight on the end of abracket 18, the latter being secured by abolt -19to an upward extension of the bushing 10, and therefore in fixedrelationto-the frame land sleeve- The s3r-in --15 is )laced undertension to exert; an angular rotation of the sleeve 9 in the directionof the shorter end of tension 12- or lower end of the valve stem 4:",and that this springis relatively light ascompared withthevalve-retracting spring -5, so that the latter may function freelyin. closing the valve against its seat 2 without appreciableresistanceby the tension of the spring 15.

Operation.

When the engine isat rest and the valve is at approximately normaltemperature the sleeve 9- is adjustedby hand to bring the proper wedgebetween the extension 12 and lower endof thevalve stem 4t with saidextension and valve stem in contact with substantially thecentral-portions of the inclined faces of the wedge thus perin' reversedirections as may be required to prevent lost motion between the cam andvalve.

During the operation of the valveby the rotation of the cam 7 the upperend of the extension 12 will have a slight'inovement along the adjacentinclined bearing face 14 due to the fact that the pivot 1l for the arm 8is rotated some distance to one side of the axis of'the cam shaft 7'-,which sliding movement, together with the slight incline oil? thebeveled faces of the wedge tends to slightly proper seating of thevalve, but in any event the seating pressure of the valve by the spring-5 together with the inclined faces. of-the wedge tend-sto move thesleeveangular-ly against the action oi the;- spring 15- so that thesetwo factors operateto maintain a tight connection between the cam andvalve to prevent lost motion be tween those parts.

I' claim:

1. The combination with a selit closing poppet valve for internalcombustionengines and a rotary cam, of means including a wedge rotatableabout an ax s parallel:

with andat one side of the axis of'thevalve for transmitting motion fromthe cams to the valve and for taking up lostmotion between said cam andvalve;

2.- The combination with a self-closingpoppet valve and a rotaryoperating camtherefor, of means for transmitting; motion from said camto the valve mcluding a camoperated' member and a wedge for transmitting motion from said member to thevalve, and adjustable about anaxis, parallel with and at one side of the axis of the valve to take uplost motion. 7

3. The combination with a self-closing poppet valve and means forintermittently opening thesame, including a wedge,and means for one.side of theaxis of the valve to take up lost motion.

4. The combination with a self-closing poppet valve and means forintermittently opening the same including a wedge rotatable about anaxis parallel with andat one side of the axis of the valve andspringactuated in the direction of its smaller end for taking'up lostmotion.

5. The combination with a self-closingpoppet valve and meansforintermittently opening the same includinga sleeve adjustable rotarilyabout an axis parallel with and.

at one side of the axis ofthe valve and provided with bearing faces atboth ends inclined circumferentially in the samedirection.

6. The combination with a self=closing poppet valve and cam shaft of aninternal combustion engine, of a rock arm actuated by the cam, and awedge adjustable rotarily about an axis parallel with and at one side ofthe axis of the valve for transmitting motion from the rock-arm to thevalve.

7 automatically adjusting t-llfii wedge about an axis parallel with andat 7. The combination with a self-closing Wedge being spring-actuated inone direcpoppet valve and earn shaft of an internal tion to compensatefor varying distances becolnbustion engine, of a rock-arm actuated tweenthe Valve and rock-arm. 10 by the cam, and a Wedge adjustable ro- InWitness whereof I have hereunto set my 5 tarily about an axis parallelWith and at one hand this 30th day of August, 1924.

side of the axis of the valve for transmitting motion from the rock-armto the Valve, said. WILLIAM M. GOODVVIN.

